JAVA 字符串拼接

        String a="aaaaa";
        String b="bbbbb";
        String c=null;
        System.out.println(StrUtil.join(",",a,b,c));
        String d= Stream.of(a,b,c).filter(o->!ObjectUtils.isEmpty(o)).collect(Collectors.joining(","));
        System.out.println(d);

输出：